code: def test_sobel_shape():
      A = np.arange(100 * 100)
      A = A % 15
      A = A.reshape((100, 100))
      assert sobel(A).shape == A.shape
      assert sobel(A, just_filter=True).shape == A.shape
  
file_path: mahotas/mahotas/tests/test_edge.py
imports: from mahotas.edge import sobel
  import pytest
  import mahotas
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: test_sobel_shape() without return types